console.log(Number(true));      //1
console.log(Number(false))      //0
console.log(Number('0111'))     //111
console.log(Number(null))       //0
console.log(Number(''))         //0
console.log(Number('1a'))       //NaN
console.log(Number(-0X11))    //-17
console.log(Number('0X11'))     //17


console.log(Boolean(0))
console.log(Boolean(null))
console.log(Boolean(undefined))
console.log(Boolean(NaN))
console.log(Boolean('12'))
console.log(Boolean(''))
console.log(Boolean(' '))
console.log(Boolean(1))
console.log(Boolean(13))

